stellatorite

Stellatorite is a rare mineral belonging to the silicate group. Its chemical formula is typically represented as approximately (Fe,Ni)2(Mg,Fe)3(Si,Al)6O15(OH)3, though variations exist. The defining characteristic of stellatorite is its distinctive stellate, or star-like, crystal habit, which is where it derives its name. These star-shaped aggregates are often composed of fine acicular or prismatic crystals.

The color of stellatorite can range from dark brown to black, with some specimens exhibiting a greenish hue. It possesses a vitreous to sub-metallic luster. Hardness on the Mohs scale is typically between 5 and 6, indicating moderate resistance to scratching. It is an opaque mineral, not allowing light to pass through.

Stellatorite is found in association with serpentinite and other metamorphic rocks. It is often formed under conditions of high pressure and moderate temperature. Notable occurrences have been reported in specific locations known for their unique geological formations, though it is not a widely distributed mineral. Its rarity and unique morphology make it of interest to mineral collectors and researchers studying mineral genesis in metamorphic environments. Analysis of its composition can provide insights into the specific chemical and physical conditions present during its formation.